MarsSeed [1] filed a deletion request for icecat-bin [2]: There are no official binaries since 2019. Package not needed. AUR has much newer icecat package.
Statement from project website: https://directory.fsf.org/wiki/Gnuzilla "Outdated official binary release Since 2019, IceCat is maintained only as source code. The last IceCat binary release was version 60.7.0, and is no longer supported. […] Please ask your distro to package IceCat." [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/icecat-bin/
